Entering Spring Constants and …
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Last modified on 1/26/2010 10:29 PM by User.

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Entering Spring Constants and InVOLS in Off line Data

In the offline force panel you can enter new values for a number of parameters. These parameters include Invols, AmpInvols and SpringConstant. So if you collect data before calibrating the cantilever, you can go back and correct the data. This is done through the parms tab of the Master Force Panel.



This panel lists the parameters for up to the first 5 force plots that are selected in the Display tab. There are also a couple of short cut buttons to make things easier. After you have entered a value for one of the displayed force plots, you can apply that value to either the displayed force plots or to all the force plots in memory. This is done with the "Set All" and the "Set Selected" buttons, which are currently disabled in the above image. After you have entered a new value the buttons will be enabled and the red box to the right will describe what the last parameter you entered, see below. The "Set Selected" button will apply what is described in the red box (in this case apply the spring constant of Force Plot Pull0003, see below), to the other force plots selected (in this case Pull0004). The "Set All" button applies the action to all the force plots in Igor's memory.



Step by Step:
1) Load your Force plots from the review button of the Force tab of the Master Panel.
2)
   A) If the loaded force curves will have a number of spring constants, then select all the force plots you want to have the same spring constant.
   B) If all the loaded force curves will the same spring constant, then select one force plot.
3) Go to the Parms tab
4) Enter the correct spring constant in one of the Spring Constant setvars shown, Note: that the units are in N/m.
5)
   A) If the loaded force curves will have a number of spring constants, then hit the Set Selected" button.
   B) If all the loaded force curves will the same spring constant, then hit the "Set All" button.
6) Repeat as needed.